MAGNETIC FIELD SENSOR DEVICE

• Main Authors: AEBA TETSUYA, SUE SATOSHI, TSUCHIYA TOMOHARU
• Format: Patent
• Language: English; Japanese
• Published: 29.03.2023
• Subjects: MEASURING; MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES; PHYSICS; TESTING

To provide a magnetic field sensor device that can highly accurately detect a magnetic field.SOLUTION: A magnetic field sensor device 1 comprises: a light-emitting element emitting incident light; an optical fiber optically connected to the light-emitting element; a magnetic field sensor provided at a tip of the optical fiber and emitting return light according to a magnetic field applied when incident light enters via the optical fiber; a magnetic field signal generation part optically connected to the magnetic field sensor via the optical fiber, and outputting based on the return light a magnetic field signal indicative of magnetic field applied to the magnetic field sensor; and an optical part transmitting the incident light via the optical fiber through the magnetic field sensor and splitting the return light to the detection signal generation part. The magnetic field signal generation part includes: a detection signal generation circuit generating a detection signal indicative of an amount of light of the return light; an off-set signal generation circuit generating an off-set signal indicative of a prescribed off-set amount; and a magnetic field signal generation circuit generating a magnetic field signal by subtracting off-set signal level from the detection signal level.SELECTED DRAWING: Figure 2 【課題】磁界を高精度で検出可能な磁界センサ装置を提供する。【解決手段】磁界センサ装置１は、入射光を出射する発光素子と、発光素子に光学的に接続された光ファイバと、光ファイバの先端に配置され、光ファイバを介して入射光が入射されたときに、印加される磁界に応じた戻り光を出射する磁界センサと、磁界センサに光ファイバを介して光学的に接続され、戻り光に基づいて、磁界センサに印加される磁界を示す磁界信号を出力する磁界信号生成部と、入射光を光ファイバを介して磁界センサに透過させ、且つ、戻り光を検出信号生成部へ分岐する光学部と、を有し、磁界信号生成部は、戻り光の光量に示す検出信号を生成する検出信号生成回路と、所定のオフセット量を示すオフセット信号を生成するオフセット信号生成回路と、検出信号のレベルからオフセット信号のレベルを減算して磁界信号を生成する磁界信号生成回路とを有する。【選択図】図２